Protecting The Motor Insulation And Bearings; Requirements Tables; Requirements For Abb Motors, P; Kw (134 Hp) - ABB ACS880-04 Hardware Manual

Protecting the motor insulation and bearings

￭
The drive employs modern IGBT inverter technology. Regardless of frequency, the
drive output comprises pulses of approximately the drive DC bus voltage with a very
short rise time. The pulse voltage can almost double at the motor terminals, depending
on the attenuation and reflection properties of the motor cable and the terminals.
This can cause additional stress on the motor and motor cable insulation.
Modern variable speed drives with their fast rising voltage pulses and high switching
frequencies can generate current pulses that flow through the motor bearings. This
can gradually erode the bearing races and rolling elements.
d u /d t filters protect motor insulation system and reduce bearing currents. Common
mode filters mainly reduce bearing currents. Insulated N-end (non-drive end) bearings
protect the motor bearings.

Requirements tables

￭
These tables show how to select the motor insulation system and when a drive d u /d t
and common mode filters and insulated N-end (non-drive end) motor bearings are
required. Ignoring the requirements or improper installation may shorten motor life
or damage the motor bearings and voids the warranty.

Requirements for ABB motors, P

See also Abbreviations (page
Motor type
Random-wound
M2_, M3_ and M4_
500 V < U
600 V < U
600 V < U
Form-wound HX_ 380 V < U
and AM_
1) 380 V < U
Old form-wound
HX_ and modular
Random-wound HX_
2)
and AM_
500 V < U
HDP Consult the motor manufacturer.
1) manufactured before 1.1.1998
2) For motors manufactured before 1.1.1998, check for additional instructions with the motor manufacturer.
< 100 kW (134 hp)
n
80).
Nominal AC line
voltage
Motor insula-
tion system
U ≤ 500 V Standard
n
≤ 600 V Standard
n
Reinforced
≤ 690 V Reinforced
n
(cable length ≤
150 m)
≤ 690 V Reinforced
n
(cable length >
150 m)
≤ 690 V Standard
n
≤ 690 V Check with
n
the motor
manufac-
turer.
0 V < U ≤ 500 V Enamelled
n
wire with
≤ 690 V
n
fiber glass
taping
Guidelines for planning the electrical installation 77
Requirement for
ABB d u /d t and common mode filters, insulated
N-end motor bearings
P < 100 kW and frame size < IEC 315
n
P < 134 hp and frame size < NEMA 500
n
+ N + d u /d t with voltages over 500 V + CMF
-
+ d u /d t
-
+ d u /d t
-
n.a.
+ N + CMF
+ N + d u /d t + CMF